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Finding the Fourth Proportional to 418.40, 579.12 and 383.84

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Solution

The fourth proportional to 418.40, 579.12 and 383.84 is: 531.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.40 : 579.12 = 383.84 : x
  2. Step 2: Convert to fraction form
    418.40/579.12 = 383.84/x
  3. Step 3: Cross multiply
    418.40x = 579.12 × 383.84
  4. Step 4: Simplify right side
    418.40x = 222,289.42
  5. Step 5: Solve for x
    x = 222,289.42/418.40
  6. Step 6: Final answer
    x = 531.28

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.